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Investment Securities - Summary of Pledged Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Held-to-maturity [1] $ 701,984 $ 683,657
Asset Pledged as Collateral | Securing public and trust department deposits, and repurchase agreements:    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale 670,969 713,033
Held-to-maturity 517,799 559,142
Asset Pledged as Collateral | Securing additional borrowing capacity at the FHLB and the FRB:    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale 96,078 85,899
Held-to-maturity $ 52,659 $ 39,607
[1]     Available-for-sale investment securities and held-to-maturity investment securities are presented net of allowance for credit losses of $0 and $238, respectively, at June 30, 2024, and $0 and $238, respectively, at December 31, 2023.